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27 April 2024 |
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The Bose topological insulator nature of the anomalous metal | | M.C. Diamantini
; C.A. Trugenberger
; Ya. Kopelevich
; S.V. Postolova
; A. Yu. Mironov
; D.M. Silevitch
; V.M. Vinokur
; | | Date: |
19 Jun 2019 | | Abstract: | An anomalous metallic phase that persists to zero temperature and represents
a new paradigm for a metal has been reported in a huge variety of
two-dimensional electronic systems, starting from the very first studies of the
superconductor-to-insulator transition (SIT). The nature of this mysterious
phase, often referred to as "Bose metal" remains unclear in spite of decades of
dedicated studies and poses a fundamental challenge for our understanding of
electron fluids. Here we construct a gauge theory of the Bose metal (BM) and
show that it is an integer bosonic topological insulator in which bulk
transport is suppressed by mutual statistics interactions between Cooper pairs
and vortices which are out of the Bose condensate due to strong quantum
fluctuations. The longitudinal charge transport in Bose metal is mediated by
U(1)-symmetry-protected gapless edge modes. We explore the
magnetic-field-driven SIT in highly controllable niobium titanium nitride
(NbTiN) films. We find the intervening metallic phase with low-temperature
saturated resistance which demonstrates the transport features of a topological
insulator. The observed scaling at the superconductor-metal and insulator-metal
dual transitions exhibits the quantum Berezinskii-Kosterlitz-Thouless (BKT)
criticality. | | Source: | arXiv, 1906.7969 | | Services: | Forum | Review | PDF | Favorites | |
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